As predicted, Mayor Bill de Blasio’s Monuments Commission turned out to be a massive waste of time, its only achievement being to allow him an exit from his overheated vows to uproot historical statues that defy politically correct thinking.

He specifically cited the Midtown statue of Christopher Columbus and the marker noting that World War I hero Philippe Petain was given a ticker-tape parade — a decade before becoming a Nazi collaborator.

In the end, both will stay put — though Columbus gets new signage to note the “pain” his “violent past” inflicts on “marginalized people.” And while the commission says Petain can remain on lower Broadway, it says the route should no longer be called the Canyon of Heroes. (Some members even said all 206 markers should be pulled.)

Theodore Roosevelt’s statue also will continue to grace the entrance to the Museum of Natural History, despite fears it shows his “dominance and superiority” over Native American and African-American figures at his feet.

But Dr. J. Marion Sims, considered the father of gynecology, gets relocated from his perch in Central Park to Green-Wood Cemetery, where he’s buried, because of his use of slave women for experiments.

This entire farce was a solution in search of a problem, a needless exercise in political posturing born of the mayor’s ill-considered bid for national publicity.

Even de Blasio admitted at one point, “The statues are really not the issues that matter to everyday New Yorkers.” He should’ve left it at that.